diff --git a/safeptrace/src/lib.rs b/safeptrace/src/lib.rs
index 1c1dfe4..67e942b 100644
--- a/safeptrace/src/lib.rs
+++ b/safeptrace/src/lib.rs
@@ -956,6 +956,8 @@ mod test {
     use nix::sys::signal::Signal;
     use nix::unistd::fork;
     use nix::unistd::ForkResult;
+    // Make sure tokio is referenced in all configurations.
+    use tokio as _;
 
     use super::*;